Display device

ABSTRACT

A display device is provided. The display device includes a substrate, a driving transistor, a first insulation layer, a first electrode and a second insulation layer. The driving transistor is disposed on the substrate and includes a gate electrode, and the gate electrode projects a first projection profile on the substrate. The first insulation layer is disposed on the driving transistor. The first electrode is disposed on the first insulation layer, and projects a second projection profile on the substrate. The second insulation layer is disposed on the first electrode and the first insulation layer. The second insulation layer has an opening, the opening exposes a portion of the first electrode, and the opening projects a third projection profile on the substrate.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of pending U.S. patent applicationSer. No. 16/266,407, filed Feb. 4, 2019 and entitled “display device”,which is a Continuation of pending U.S. patent application Ser. No.15/814,727, filed Nov. 16, 2017 and entitled “display device” (now U.S.Pat. No. 10,243,161, issued on Mar. 26, 2019), which claims priority ofChina Patent Application No. 201611103382.6, filed on Dec. 5, 2016, theentirety of which is incorporated by reference herein.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

The present disclosure relates to a display device, and in particular toan organic light-emitting display device.

Description of the Related Art

Recently, there has been much development of technologies applicable foruse in electronic products. Electronic products such as mobile phones,personal digital assistants (PDA), and notebook computers require flatpanel displays (FPD) that are smaller and use less power. Examples ofsuch flat panel displays (FPD) include liquid-crystal display (LCD)devices, organic light-emitting display (OLED) devices,micro-electromechanical (MEMS) devices, and electrophoretic display(EPD) devices. The level of brightness provided by current organiclight-emitting display devices is uneven, and improvement is desired.

BRIEF SUMMARY OF THE DISCLOSURE

In one embodiment, a display device is provided. The display deviceincludes a substrate, a driving transistor, a first insulation layer, afirst electrode and a second insulation layer. The driving transistor isdisposed on the substrate, wherein the driving transistor comprises agate electrode, and the gate electrode projects a first projectionprofile on the substrate. The first insulation layer is disposed on thedrive transistor. The first electrode is disposed on the firstinsulation layer, wherein the first electrode projects a secondprojection profile on the substrate. The second insulation layer isdisposed on the first electrode and the first insulation layer, whereinthe second insulation layer has an opening, the opening exposes aportion of the first electrode, and the opening projects a thirdprojection profile on the substrate. The first projection profileintersects the second projection profile at a first intersection pointand a second intersection point, an extending line passes the firstintersection point and the second intersection point, and the extendingline intersects the third projection profile at a third intersectionpoint.

A detailed description is given in the following embodiments withreference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thesubsequent detailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 shows a display device of an embodiment of the disclosure;

FIG. 2 shows the major structure of the display device of the embodimentof the disclosure; and

FIG. 3 is a sectional view along the direction III-III of FIG. 2.

DETAILED DESCRIPTION OF THE DISCLOSURE

In this disclosure, the object A is disposed (or located) on (or above)object B means that object A is indirectly on object B, and one or morefilms can be formed between object A and object B. Or, alternatively, itmeans that object A is directly on object B, and no other film ispresent between object A and object B.

FIG. 1 shows a display device of an embodiment of the disclosure. FIG. 2shows the major structure of the display device of the embodiment of thedisclosure. FIG. 3 is a sectional view along the direction III-III ofFIG. 2. With reference to FIGS. 1, 2 and 3, the display device Dincludes a substrate 11, a driving transistor 2, a first insulationlayer 31, a first electrode 41 and a second insulation layer 32.

The driving transistor 2 is disposed on the substrate 11. The drivingtransistor 2 includes a gate electrode M1, an active layer 71, a sourceelectrode and a drain electrode. FIG. 3 shows the source electrode orthe drain electrode 21. The gate electrode M1 projects a firstprojection profile A1 on the substrate 11. The first insulation layer 31is disposed on the driving transistor 2. The first electrode 41 isdisposed on the first insulation layer 31. The first electrode 41projects a second projection profile A2 on the substrate 11. The secondinsulation layer 32 is disposed on the first electrode 41 and the firstinsulation layer 31. The second insulation layer 32 has an opening 321.The opening 321 exposes a portion of the first electrode 41. The opening321 projects a third projection profile A3 on the substrate 11. Thefirst projection profile A1 intersects the second projection profile A2at a first intersection point P1 and a second intersection point P2. Anextending line L passes the first intersection point P1 and the secondintersection point P2. The extending line L intersects the thirdprojection profile A3 at a third intersection point P3.

With reference to FIG. 3, according to some embodiments, the displaydevice D further includes an illumination layer 43 and a secondelectrode 42. The illumination layer 43 is located between the firstelectrode 41 and the second electrode 42. According to some embodiments,the illumination layer 43 is located in the opening 321 and on the firstelectrode 41. The second electrode 42 is located on the illuminationlayer 43. The second electrode 42 can be disposed on the secondinsulation layer 32, and the second electrode 42 can be partiallylocated in the opening 321. In some embodiments, the first electrode 41can be an anode, and the second electrode 42 can be a cathode. In someembodiments, the illumination layer 43 can be an organic illuminationlayer, and thus, the display device D can be an organic light-emittingdisplay device (OLED device). According to other embodiment, the displayD can also be a micro LED display device.

With reference to FIGS. 2 and 3, in this embodiment, the opening 321corresponds to a first illumination area 51. In a conventional organiclight-emitting display device, a portion of the light provided by theillumination area is reflected to a channel area of the drivingtransistor, the current of the driving transistor is therefore unstable,and the brightness of the display device is altered, making the displayhaving a non-uniform brightness performance. Utilizing the embodimentsof the disclosure, the first electrode 41 at least partially overlapsthe gate electrode M1. The first intersection point P1, the secondintersection point P2 and the third intersection point P3 are located onthe same extending line L. Therefore, the light provided by the firstillumination area 51 can be blocked by the first electrode 41. Thus, thefirst active layer 71 (channel area) of the driving transistor 2 is noteasily affected. The display thus can have uniform and stablebrightness.

With reference to FIG. 1, the display device D further comprises asecond illumination area 52 and a third illumination area 53. The firstillumination area 51, the second illumination area 52 and the thirdillumination area 53 provide lights of different colors. According tosome embodiments, the first illumination area 51 is smaller than thesecond illumination area 52, and the first illumination area 51 issmaller than the third illumination area 53. In other words, by at leastpartially overlapping the first electrode 41 of the first illuminationarea 51 with the gate electrode M1, the required area of the firstelectrode is decreased.

FIG. 1 shows the embodiment having two second illumination areas 52 andtwo third illumination areas 53. The first illumination area 51 islocated between the two second illumination areas 52, and the firstillumination area 51 is located between the two third illumination areas53. In some embodiments, the first illumination area 51 provides thegreen light, the second illumination areas 52 provide the red light, andthe third illumination areas 53 provide the blue light. In anotherembodiment, the second illumination areas 52 provide the blue light, andthe third illumination areas 53 provide the red light.

With reference to FIGS. 2 and 3, in some embodiments, when viewed in afirst direction R1, the first electrode 41 at least partially overlapsthe gate electrode M1 to form a first portion 411 (marked by diagonallines). The first direction R1 is perpendicular to the substrate 11.When viewed in the first direction R1, the first portion 411 isseparated from the opening 321. In other words, the first portion 411does not overlap the opening 321. The display thus can prove uniform andstable illumination.

With reference to FIG. 2, in some embodiments, the display device Dfurther includes a power line 61, and the power line 61 is electricallyconnected to the driving transistor 2. The first portion 411 does notoverlap the power line 61. In other words, when viewed in the firstdirection R1, the first portion 411 is separated from the power line 61.The parasitic capacitance between the first portion 411 and the powerline 61 is therefore prevented. In some embodiments, the display deviceD further includes a data line 62 disposed on the substrate 11. The dataline 62 can be parallel to the power line 61, and extends in a seconddirection Y. The power line 61 can be located between the data line 62and the first portion 411 of the first electrode 41.

In some embodiments, the first projection profile A1 intersects thesecond projection profile A2 at the first intersection point P1 and thesecond intersection point P2. The extending line L passes the firstintersection point P1 and the second intersection point P2. An includedangle is formed between the extending line L and the second direction Yand is between 0 degrees and 45 degrees. For example, the included angleis between 0 degrees and 30 degrees, or between 0 degrees and 20degrees, or between 0 degrees and 10 degrees, or between 0 degrees and 5degrees. In some embodiments, the first intersection point P1 and thesecond intersection point P2 are adjacent to a first side S1 of the gateelectrode M1. The first side S1 is the side closer to the power line 61.The first side S1 can also be the side closer to the data line 62.According to some embodiments, when viewed in the first direction R1,the first side S1 of the gate electrode at least partially overlaps thepower line 61.

With reference to FIG. 3, in some embodiments, the display device Dfurther includes an illumination transistor 8. The illuminationtransistor 8 can be coupled to the first electrode 41. For example, theillumination transistor 8 can be coupled to the first electrode 41 viathe source electrode or the drain electrode 81. The illuminationtransistor 8 can be located between the driving transistor 2 and thefirst illumination area 51. The illumination transistor 8 can include asecond active layer 72. The second active layer 72 of illuminationtransistor 8 and the first active layer 71 of the driving transistor 2can be of the same layer, and the second active layer 72 can beconnected to the first active layer 71.

According to some embodiments, the gate electrode of the drivingtransistor at least partially overlaps the first electrode of theillumination area. The first projection profile of the gate electrodeprojected on the substrate intersects the second projection profile ofthe first electrode projected on the substrate at the first intersectionpoint and the second intersection point. The extending line passing thefirst intersection point and the second intersection point intersectsthe third projection profile of the opening projected on the substrateat the third intersection point. The light provided by the illuminationcan be blocked by the first electrode. Thus, the channel area of thedriving transistor is not easily affected. The display can thus haveuniform and stable brightness.

Use of ordinal terms such as “first”, “second”, “third”, etc., in theclaims to modify a claim element does not by itself connote anypriority, precedence, or order of one claim element over another or thetemporal order in which acts of a method are performed, but are usedmerely as labels to distinguish one claim element having a certain namefrom another element having the same name (but for use of the ordinalterm).

While the disclosure has been described by way of example and in termsof the preferred embodiments, it should be understood that thedisclosure is not limited to the disclosed embodiments. On the contrary,it is intended to cover various modifications and similar arrangements(as would be apparent to those skilled in the art). Therefore, the scopeof the appended claims should be accorded the broadest interpretation soas to encompass all such modifications and similar arrangements.

What is claimed is:
 1. A display device, including an illumination area,and comprising: a substrate; a power line disposed on the substrate; anda driving transistor disposed on the substrate, the driving transistorcomprising a gate electrode, wherein in view of a first directionperpendicular to the substrate, the gate electrode partially overlapsthe power line; and wherein in view of the first direction, the gateelectrode is separated from the illumination area.
 2. The display deviceas claimed in claim 1, wherein the power line is electrically connectedto the driving transistor.
 3. The display device as claimed in claim 1,comprising an illumination transistor, wherein the driving transistorincludes a first active layer, the illumination transistor includes asecond active layer, and the second active layer is connected to thefirst active layer.
 4. The display device as claimed in claim 3, whereinthe first active layer and the second active layer are of the samelayer.
 5. The display device as claimed in claim 3, comprising anelectrode coupled to the illumination transistor.
 6. The display deviceas claimed in claim 5, wherein the electrode is an anode.
 7. The displaydevice as claimed in claim 5, wherein the electrode at least partiallyoverlaps the gate electrode to form a portion.
 8. The display device asclaimed in claim 7, comprising a data line, wherein the power line isdisposed between the data line and the portion.
 9. The display device asclaimed in claim 1, wherein the illumination area provides a greenlight.
 10. The display device as claimed in claim 1, wherein theillumination area provides a blue light.
 11. The display device asclaimed in claim 1, wherein the illumination area provides a red light.